[2] He ran for Massachusetts Attorney General in 1966, but dropped out of the race before the Republican primary.

[3] He lost his chairmanship on May 25, 1972, amid allegations that he was being investigated by the State Attorney General's office for fraud.

He was acquitted by a jury and later sued former Governor Francis W. Sargent, former Attorney General Robert H. Quinn, former State Insurance Commissioner John G. Ryan, and former Secretary of Consumer Affairs William Cowin.

Hahn alleged that the defendants had violated his rights under the Civil Rights Act of 1871 when they "perjured themselves, suborned perjury, suppressed evidence and manipulated administrative processes in an effort to destroy appellant's political career by generating adverse publicity and procuring his indictment."

Three of the charges were dismissed and a summary judgment in favor of the defendants was issued on the fourth.